<template>
    <div>
        <!-- 面包屑导航区-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域-->
        <el-card>
            <!-- 警告区域-->
            <el-alert
                    title="注意：只允许为第三级分类设置相关参数!"
                    type="warning" :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区域-->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框-->
                    <el-cascader
                            expand-trigger="hover"
                            v-model="selectedCateKeys"
                            :options="catelist"
                            :props="cateProps"
                            @change="handleChange"></el-cascader>
                </el-col>
            </el-row>
            <!-- tab页签区域-->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板-->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮-->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格-->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!--循环渲染Tag标签-->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!--输入的文本框-->
                                <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!--添加按钮-->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列-->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope"> <!-- slot-scope="scope"-->
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板-->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮-->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格-->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!--循环渲染Tag标签-->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!--输入的文本框-->
                                <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!--添加按钮-->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列-->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">  <!-- slot-scope="scope"-->
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini"  @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>

            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框-->
        <el-dialog
                :title="'添加' + titleText"
                :visible.sync="addDialogVisible"
                width="50%" @close="addDialogClosed">
            <!-- 添加参数的对话框-->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
        </el-dialog>
        <!-- 修改参数的对话框-->
        <el-dialog
                :title="'修改' + titleText"
                :visible.sync="editDialogVisible"
                width="50%" @close="editDialogClosed">
            <!-- 添加参数的对话框-->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        data(){
            return{
                //商品分类列表
                catelist:[],
                //级联选择框的配置对象
                cateProps:{
                    value:'cat_id',
                    label:'cat_name',
                    children:'children'
                },
                //级联选择框双向绑定到的数组
                selectedCateKeys:[],
                //被激活的页签的名称
                activeName:'many',
                //动态参数的数据
                manyTableData:[],
                //静态属性的数据
                onlyTableData:[],
                //控制添加对话框的显示与隐藏
                addDialogVisible:false,
                //添加参数的表单数据对象
                addForm:{
                    attr_name:''
                },
                //添加表单的验证规则对象
                addFormRules:{
                    attr_name:[{required:true,message:'请输入参数名称:',trigger:'blur'}]
                },
                //控制修改对话框的显示与隐藏
                editDialogVisible:false,
                //修改的表单数据对象
                editForm:{},
                //修改表单的验证规则对象
                editFormRules:{
                    attr_name:[{required:true,message:'请输入参数名称:',trigger:'blur'}]
                },

            }
        },
        created() {
            this.getCateList()
        },
        methods:{
            //获取所有的商品分类列表
            async getCateList(){
                const {data:res} = await this.$http.get('categories')
                if (res.meta.status !== 200){
                    return this.$message.error('获取商品分类失败！')
                }
                this.catelist = res.data
            },
            //级联选择框选中项变化,会触发这个函数
            handleChange(){
                this.getParamsData()
            },
            //tab页签点击事件的处理函数
            handleTabClick(){
                this.getParamsData()
            },
            //获取参数的列表数据
            async getParamsData(){
                //证明选中的不是三级分类
                if (this.selectedCateKeys.length !== 3){
                    this.selectedCateKeys = []
                    this.manyTableData = []
                    this.onlyTableData = []
                    return
                }
                //    证明选中的是三级分类
                //    根据所选分类的id和当前所处的面板。获取对应的参数
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                    {params:{sel:this.activeName}})
                if (res.meta.status !== 200){
                    return this.$message.error('获取参数列表失败!')
                }
                res.data.forEach(item =>{
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                //    控制文本框的显示与隐藏
                    item.inputVisible = false
                //    文本框中输入的值
                    item.inputValue = ''

                })
                if (this.activeName === 'many'){
                    this.manyTableData = res.data
                }else{
                    this.onlyTableData = res.data
                }
            },
            //监听添加对话框的关闭事件
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            //点击按钮添加参数
            addParams(){
                this.$refs.addFormRef.validate(async valid =>{
                    if (!valid) return
                    const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                        attr_name:this.addForm.attr_name,
                        attr_sel:this.activeName
                    })
                    if (res.meta.status !== 201){
                        return this.$message.error('添加参数失败!')
                    }
                    this.$message.success('添加参数成功!')
                    this.addDialogVisible = false
                    this.getParamsData()
                })
            },
            //点击按钮展示修改的对话框
            async showEditDialog(attr_id){
                //查询当前参数的信息
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                    params:{attr_sel:this.activeName}
                })
                if (res.meta.status !== 200){
                    return this.$message.error('获取参数信息失败!')
                }
                this.editForm = res.data
                this.editDialogVisible = true
            },
            //重置的修改的表单
            editDialogClosed(){
                this.$refs.editFormRef.resetFields()
            },
            //点击按钮修改参数信息
            editParams(){
                this.$refs.editFormRef.validate(async valid =>{
                    if (!valid) return
                    const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                        {
                            attr_name:this.editForm.attr_name,
                            attr_sel:this.activeName
                        })
                    if (res.meta.status !== 200){
                        return this.$message.error('修改参数信息失败!')
                    }
                    this.$message.success('修改参数信息成功!')
                    this.getParamsData()
                    this.editDialogVisible = false
                })
            },
            //根据id删除对应的参数项
            async removeParams(attr_id) {
                const confirmResult = await this.$confirm(
                    '此操作将永久删除该参数, 是否继续?',
                    '提示',
                    {
                        confirmButtonText: '确定',
                        cancelButtonText: '取消',
                        type: 'warning'
                    }
                ).catch(err => err)

                // 用户取消了删除的操作
                if (confirmResult !== 'confirm') {
                    return this.$message.info('已取消删除！')
                }

                // 删除的业务逻辑
                const { data: res } = await this.$http.delete(
                    `categories/${this.cateId}/attributes/${attr_id}`
                )

                if (res.meta.status !== 200) {
                    return this.$message.error('删除参数失败！')
                }

                this.$message.success('删除参数成功！')
                this.getParamsData()
            },
            //文本框失去焦点或摁下了Enter都会触发
            async handleInputConfirm(row){
                if (row.inputValue.trim().length === 0) {
                    row.inputValue = ''
                    row.inputVisible = false
                    return
                }
            //    如果没有return，则证明输入的内容需要做后续处理
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false
            //    需要发起请求保存着这次操作
                this.saveAttrVals(row)
            },
            //将对attr_vals的操作保存到数据库
            async saveAttrVals(row){
                //    需要发起请求保存着这次操作
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                    attr_name:row.attr_name,
                    attr_sel:row.attr_sel,
                    attr_vals:row.attr_vals.join(' '),
                })
                if (res.meta.status !== 200){
                    return this.$message.error('修改参数信息失败!')
                }
                this.$message.success('修改参数信息成功!')
            },
            //点击按钮展示文本输入框
            showInput(row){
                row.inputVisible = true
                //让文本框自动获得焦点
                //$nextTick方法的作用就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                    console.log(_)
                });

            },
            //删除对应的参数可选项
            handleClose(i,row){
                row.attr_vals.splice(i,1)
                this.saveAttrVals(row)
            }
        },
        computed:{
        //    如果按钮需要被禁用，则返回true,否则返回false
            isBtnDisabled(){
                if (this.selectedCateKeys.length !== 3){
                    return true
                }
                return false
            },
        //    当前选中的三级分类的id
            cateId(){
                if (this.selectedCateKeys.length === 3){
                    return this.selectedCateKeys[2]
                }
                return null
            },
        //    动态计算标题的文本
            titleText(){
                if (this.activeName === 'many'){
                    return '动态参数'
                }
                return '静态属性'
            },

        }
    }
</script>

<style scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag{
        margin: 5px;
    }
    .input-new-tag{
        width: 120px;
    }
</style>